linux-kernel - Re: [PATCH 2/8 v3] Documentation: bindings: k3dma: Add binding for hisi-dma-avail-chan

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Date:   Fri, 11 Jan 2019 13:30:35 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, Vinod Koul <vkoul@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tanglei Han <hantanglei@...wei.com>,
        Zhuangluan Su <suzhuangluan@...ilicon.com>,
        Ryan Grachek <ryan@...ted.us>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/8 v3] Documentation: bindings: k3dma: Add binding for hisi-dma-avail-chan

On Fri, Jan 11, 2019 at 12:04 PM Rob Herring <robh+dt@...nel.org> wrote:
>
> On Fri, Jan 11, 2019 at 1:58 PM Rob Herring <robh+dt@...nel.org> wrote:
> >
> > On Thu, Jan 10, 2019 at 11:34 AM John Stultz <john.stultz@...aro.org> wrote:
> > >
> > > Some dma channels can be reserved for secure mode or other
> > > hardware on the SoC, so provide a binding for a bitmask
> > > listing the available channels for the kernel to use.
> > >
> > > Cc: Vinod Koul <vkoul@...nel.org>
> > > Cc: Rob Herring <robh+dt@...nel.org>
> > > Cc: Mark Rutland <mark.rutland@....com>
> > > Cc: Tanglei Han <hantanglei@...wei.com>
> > > Cc: Zhuangluan Su <suzhuangluan@...ilicon.com>
> > > Cc: Ryan Grachek <ryan@...ted.us>
> > > Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > Cc: dmaengine@...r.kernel.org
> > > Cc: devicetree@...r.kernel.org
> > > Signed-off-by: John Stultz <john.stultz@...aro.org>
> > > ---
> > > v3: Renamed to hisi-dma-avail-chan
> > > ---
> > >  Documentation/devicetree/bindings/dma/k3dma.txt | 3 +++
> > >  1 file changed, 3 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/dma/k3dma.txt b/Documentation/devicetree/bindings/dma/k3dma.txt
> > > index 10a2f15..38825d4 100644
> > > --- a/Documentation/devicetree/bindings/dma/k3dma.txt
> > > +++ b/Documentation/devicetree/bindings/dma/k3dma.txt
> > > @@ -14,6 +14,9 @@ Required properties:
> > >                 have specific request line
> > >  - clocks: clock required
> > >
> > > +Optional properties:
> > > +- hisi-dma-avail-chan: Bitmask of available physical channels
> >
> > Not quite right. Should be: hisilicon,dma-avail-chan
>
> Actually, we already have the same case elsewhere with
> 'brcm,dma-channel-mask'. Maybe there are others. So make the property
> common (i.e. documented in dma.txt) and called 'dma-channel-mask'.

Ok. I'll rework it for that then.

> Whether or not the dmaengine handles this or not is irrelevant to
> whether the binding is common or not. I have no say over OS design
> decisions.

Ok. I'll keep it in the driver for now unless otherwise directed.

Thanks so much for the review!
-john